Tool bit and holder therefor



March 14, 1950 H. M sHERlDAN 2,500,387

TOOL BIT AND HOLDER THEREFOR Filed June 20, 1945 IN VENT OR.

Patented Mar. 14, 1950 UNITED STATES TENT OFFICEy Henry M. Sheridan,Erie, Pa., assignor to Apex Tool & Cutter Company, Shelton, Conn., acorporation of Connecticut Application .lune 20, 1945, Serial No.600,542

5 Claims. 1

This invention relates to tool bits and holders therefor, and isparticularly concerned with screw lock holders in which at least oneadjustment or the securement of the bit is made by application of awrench to a longitudinally extending screw rotation of which moves a bitsecuring element.

The prime object of the invention is to provide a new and improved toolbit holder which will provide a maximum rigidity between the bit and itsholder and which will permit easy insertion and removal of the bit fromthe holder and which lends itself to easy and accurate adjustment of thebit in the holder.

Another object of the invention is to provide a holder so formed as tosecure the bit in a manner such .that the cutting strains appliedthereto will be translated from the pure transverse or longitudinal andthus be dissipated through the head with-a minimum of strain to thesecuring bolts.

A further object of the invention is to provide a holder of the typereferred to in which supplemental clamping and adjusting means areprovided to preclude accidental transverse movement of the bit withinthe holder.

A still further object of the invention is to pro- Other objects andfeatures of the invention will be apparent from a consideration of thefollowing specication taken in conjunction with the accompanyingdrawing, in which:

Fig. 1 is a top plan View of one of the preferred embodiments of thepresent invention;

Fig. 2 is a side elevation of that form of the invention shown in Fig.1;

Fig. 3 is an end elevation of the device as shown in Figs. 1 and 2;

Fig. 4 is a modified form of the invention shown in Figs. l through 3,and

Fig. 5 is a fragmentary sectional view of a further modiiication of theinventive concept.

The invention may be defined in general terms as comprising a holderbody having a tool seat adapted to be drawn towards a bit by a boltextending longitudinally of the holder body and further including aseparate bit clamp adjustably secured to the tool head for separateadjustment whereby the seat and clamp cooperaf tively engage the bit andretain it securely in the holder.

More specifically as may be noted by reference to the Figs. 1 through 3of the drawings, the invention comprises a body I0 which may be ofelongated rectangular configuration as here shown or may be angularlydisposed with respect to its head li or otherwise arranged for mountingadvantageously within a machine tool. The head II which is here shown asmerely the extended left end of the body l0 is provided with anadjustable tool seat l2 including a bit table i3 which is formed by aplain transverse surface below the top surface of the body and having avertically and transversely inclined bit engaging shoulder lil. Ifdesired the table i3 may be provided with serrations with which likeserrations of tool bit l5 may cooperate. The tool seat I 2 is mountedfor longitudinal adjustment on the head li by virtue of a threaded shankI6 which extends into the body ID and engages a draw bolt il which maybe conveniently actuated from the rear of the holder. Thusthe seat maybe moved towards and from a vertically and transversely inclined endwall lll of the body. For assisting the tool seat I2I in rigidlysecuring the bit I5 iixedly with respect to the head II a clamp I9 isprovided, the upper surface of which may advantageously be parallel tothe upper surface of the body iii. The under surface of the clamp i9 ispreferably cut away to provide a clearance with the lower inner sideedge of the bit I5. The remainder of the under surface rests upon a,side platform adjacent the surface I3, these surfaces being preferablyserrated as shown in Figs. 2 and 3. The inner longitudinal bitcontaining wall 22 of the clamp i9 is vertically inclined to lie overand engage the oppositely inclined side wall of the bit l5, while thetransverse end. or body contacting surface 23 of the clamp is bothtransversely and vertically inclined to conform with the inclination ofthe wall I8. The clamp i9 is provided with an elongated and inclinedslot 24 which receives therethrough a securing bolt Z5. The inclinationis such as to permit simultaneous transverse and longitudinal movementof the clamp so that it may be adjusted along the surface I8.

The bit l5 is provided with an inner end surface 26 which is verticallyand transversely inclined in conformity to the inclination of the wallI8 and is further provided with an inclined shoulder 2l which conformsto the combined vertical and transverse inclinations of the portion I4of the bit seat.

From this construction, it will be seen that the inward thrust by the,shoulder lll will have both a longitudinal and transverse component thusurging the bit against the clamp surface as well as against the surfacei 8 while both the surfaces I8 and 22 will hold the bit down upon thesurface i3. Thus it will be seen that the various inclinations oftheelements combine and cooperate to bring about rigid and vibrationlesslocking of the bit in the holder.

In that form of the invention shown in Fig. 4, there is a doubletransverse inclination of the end Wall of the holder thus providingangularly related surfaces 30 and 3l which may be joined by a radius 32.In this instance,- since the inclination of surface30 is opposite tothat shown in Fig. 1, the slot 33 of the clamp 34 is inclined oppositelyfrom the slot 24 of the clamp I9. It

Will be readily seen that in this instance thetransverse adjustment ofthe clamp is accompanied by any inward movement and the thrust oftheclamp therefore assists in urging the bit 4I firmly against the surface3 I.

By reference to Fig. 5, it will be noted that the invention is notlimited to the use of a draw bolt actuated from the rear and in thisinstance the seat 40 is adjusted toward and from the bit 4| by a frontactuated bolt 42, the shoulder 43 of which engages the seat 40 while theshank 44 is threadably adjustable within the head 45. If desired, thebolt 42 may have oppositely or differently pitched threads in engagementwith the seat so as to enhance the accuracy of its adjustment uponmanipulation of the bolt.

It will, of course, be understood that in all forms of the inventionnumerous changes and modifications may be resorted to without departurefrom the spirit or scope of the invention as outlined in the appendedclaims.

What I claim is:

1. A tool holder having a body With a head thereon, a bit seat movablymounted on said head and presenting a bit supporting table, a clampmounted on said head and movable to alternative positions with respectto said body and head for Varying the position of a tool bit located onsaid table, said bit seat, body and clamp having co. operating bitretaining surfaces thereon, and means for moving said bit seat withrespect to said body to hold a tool bit in engagement with saidsurfaces.

2. A tool holder having a body with a head thereon, a bit seat movablymounted on said head and presenting a bit supporting table, a clampmounted on said head and movable to alternative positions with respectto said body and head for varying the position of a tool bit located onsaid table, said bit seat and body each having an inclined bit retainingsurface positioned to overlie a tool bit located on said table, andmeans for moving said bit seat with respect to said body to hold a toolbit in engagement with said surfaces.

3. A tool holder having a body with a head thereon, a bit seat movablymounted on said head and presenting a bit supporting table, a clampmounted on said head and movable to alternative positions with respectto said body and head for varying the position of a tool bit located onsaid table, said bit seat, clamp and body each presenting an inclinedbit engaging surface positioned to overlie a tool bit located on saidtable, and means for moving said bit seat with respect to said body tohold a tool bit in engagement with said surfaces.

4. A tool holder having a body with a head thereon, a bit seat movablymounted on said head and presenting a bit supporting table, a clampmounted on said head and movable to alternative positions with respectto said body and head for varying the position of a tool bit located onsaid table, said bit seat, clamp and body each presenting an inclinedbit engaging surface positioned to overlie a tool bit located on saidtable, the bit engaging surfaces of said bit seat and body beingoppositely inclined in a direction transverse of said table, and meansfor moving said bit seat with respect to said body to hold a tool bit inengagement with said surfaces.

5. A tool holder having a body with a head thereon, a bit seat movablymounted on said head and presenting a bit supporting table, a clampmounted on said head and movable to alternative positions With respectto said body and head for varying the position of a tool bit located onsaid table, Said bit seat, clamp and body each presenting an inclinedbit engaging surface positioned to overlie a tool bit located on saidtable, the bit engaging surfaces of said bit seat and body beingoppositely inclined in a direction transverse of said table, and spacedapart a greater distance adjacent said clamp than at points remotetherefrom, and means for moving said bit seat with respect to said bodyto hold a tool bit in engagement with said surfaces.

HENRY M. SHERIDAN.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 867,798 Collins Oct. 8, 19071,311,897 Ihrmark Aug. 5, 1919 2,063,129 Severson Dec. 8, 1936 2,140,941Reaney Dec. 20, 1938 2,160,369 Rikof May 30, 1939 2,181,023 Moore Nov.21, 1939 2,847,136 Speckert Apr. 18, 1944 FOREIGN PATENTS Number CountryDate 609,757 France May 18, 1926 813,108 France Feb. 15, 1937

